1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Private Support Information for POSIX Threads |
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5 | * @ingroup POSIX_PTHREADS Private Threads |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2014. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | #include <stdio.h> |
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21 | |
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22 | #include <errno.h> |
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23 | #include <pthread.h> |
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24 | #include <limits.h> |
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25 | #include <assert.h> |
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26 | |
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27 | #include <rtems/system.h> |
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28 | #include <rtems/config.h> |
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29 | #include <rtems/sysinit.h> |
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30 | #include <rtems/score/stack.h> |
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31 | #include <rtems/score/threadimpl.h> |
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32 | #include <rtems/score/threadqimpl.h> |
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33 | #include <rtems/score/userextimpl.h> |
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34 | #include <rtems/score/watchdogimpl.h> |
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35 | #include <rtems/score/wkspace.h> |
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36 | #include <rtems/posix/pthreadimpl.h> |
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37 | #include <rtems/posix/priorityimpl.h> |
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38 | #include <rtems/posix/psignalimpl.h> |
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39 | #include <rtems/posix/config.h> |
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40 | #include <rtems/posix/keyimpl.h> |
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41 | #include <rtems/score/timespec.h> |
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42 | #include <rtems/score/cpusetimpl.h> |
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43 | #include <rtems/score/assert.h> |
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44 | |
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45 | Thread_Information _POSIX_Threads_Information; |
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46 | |
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47 | /* |
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48 | * The default pthreads attributes structure. |
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49 | * |
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50 | * NOTE: Be careful .. if the default attribute set changes, |
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51 | * _POSIX_Threads_Initialize_user_threads will need to be examined. |
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52 | */ |
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53 | pthread_attr_t _POSIX_Threads_Default_attributes = { |
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54 | .is_initialized = true, /* is_initialized */ |
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55 | .stackaddr = NULL, /* stackaddr */ |
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56 | .stacksize = 0, /* stacksize -- will be adjusted to minimum */ |
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57 | .contentionscope = PTHREAD_SCOPE_PROCESS, /* contentionscope */ |
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58 | .inheritsched = PTHREAD_INHERIT_SCHED, /* inheritsched */ |
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59 | .schedpolicy = SCHED_FIFO, /* schedpolicy */ |
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60 | .schedparam = |
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61 | { /* schedparam */ |
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62 | 2, /* sched_priority */ |
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63 | #if defined(_POSIX_SPORADIC_SERVER) || \ |
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64 | defined(_POSIX_THREAD_SPORADIC_SERVER) |
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65 | 0, /* sched_ss_low_priority */ |
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66 | { 0L, 0 }, /* sched_ss_repl_period */ |
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67 | { 0L, 0 }, /* sched_ss_init_budget */ |
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68 | 0 /* sched_ss_max_repl */ |
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69 | #endif |
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70 | }, |
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71 | |
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72 | #if HAVE_DECL_PTHREAD_ATTR_SETGUARDSIZE |
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73 | .guardsize = 0, /* guardsize */ |
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74 | #endif |
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75 | #if defined(_POSIX_THREAD_CPUTIME) |
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76 | .cputime_clock_allowed = 1, /* cputime_clock_allowed */ |
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77 | #endif |
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78 | .detachstate = PTHREAD_CREATE_JOINABLE, /* detachstate */ |
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79 | #if defined(__RTEMS_HAVE_SYS_CPUSET_H__) |
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80 | .affinitysetsize = 0, |
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81 | .affinityset = NULL, |
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82 | .affinitysetpreallocated = {{0x0}} |
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83 | #endif |
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84 | }; |
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85 | |
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86 | static bool _POSIX_Threads_Sporadic_budget_TSR_filter( |
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87 | Thread_Control *the_thread, |
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88 | Priority_Control *new_priority, |
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89 | void *arg |
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90 | ) |
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91 | { |
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92 | the_thread->real_priority = *new_priority; |
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93 | |
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94 | /* |
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95 | * If holding a resource, then do not change it. |
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96 | * |
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97 | * If this would make them less important, then do not change it. |
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98 | */ |
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99 | return !_Thread_Owns_resources( the_thread ) && |
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100 | _Thread_Priority_less_than( the_thread->current_priority, *new_priority ); |
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101 | } |
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102 | |
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103 | /* |
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104 | * _POSIX_Threads_Sporadic_budget_TSR |
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105 | */ |
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106 | void _POSIX_Threads_Sporadic_budget_TSR( Watchdog_Control *watchdog ) |
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107 | { |
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108 | POSIX_API_Control *api; |
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109 | Thread_Control *the_thread; |
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110 | ISR_lock_Context lock_context; |
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111 | Priority_Control new_priority; |
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112 | |
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113 | api = RTEMS_CONTAINER_OF( watchdog, POSIX_API_Control, Sporadic_timer ); |
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114 | the_thread = api->thread; |
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115 | |
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116 | _Thread_State_acquire( the_thread, &lock_context ); |
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117 | |
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118 | the_thread->cpu_time_budget = |
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119 | _Timespec_To_ticks( &api->schedparam.sched_ss_init_budget ); |
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120 | |
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121 | _Watchdog_Per_CPU_remove_relative( &api->Sporadic_timer ); |
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122 | _Watchdog_Per_CPU_insert_relative( |
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123 | &api->Sporadic_timer, |
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124 | _Per_CPU_Get(), |
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125 | _Timespec_To_ticks( &api->schedparam.sched_ss_repl_period ) |
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126 | ); |
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127 | |
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128 | new_priority = _POSIX_Priority_To_core( api->schedparam.sched_priority ); |
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129 | |
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130 | _Thread_State_release( the_thread, &lock_context ); |
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131 | |
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132 | _Thread_Change_priority( |
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133 | the_thread, |
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134 | new_priority, |
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135 | NULL, |
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136 | _POSIX_Threads_Sporadic_budget_TSR_filter, |
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137 | true |
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138 | ); |
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139 | } |
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140 | |
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141 | static bool _POSIX_Threads_Sporadic_budget_callout_filter( |
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142 | Thread_Control *the_thread, |
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143 | Priority_Control *new_priority, |
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144 | void *arg |
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145 | ) |
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146 | { |
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147 | the_thread->real_priority = *new_priority; |
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148 | |
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149 | /* |
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150 | * If holding a resource, then do not change it. |
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151 | * |
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152 | * Make sure we are actually lowering it. If they have lowered it |
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153 | * to logically lower than sched_ss_low_priority, then we do not want to |
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154 | * change it. |
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155 | */ |
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156 | return !_Thread_Owns_resources( the_thread ) && |
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157 | _Thread_Priority_less_than( *new_priority, the_thread->current_priority ); |
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158 | } |
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159 | |
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160 | /* |
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161 | * _POSIX_Threads_Sporadic_budget_callout |
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162 | */ |
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163 | void _POSIX_Threads_Sporadic_budget_callout( |
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164 | Thread_Control *the_thread |
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165 | ) |
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166 | { |
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167 | POSIX_API_Control *api; |
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168 | |
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169 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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170 | |
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171 | /* |
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172 | * This will prevent the thread from consuming its entire "budget" |
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173 | * while at low priority. |
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174 | */ |
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175 | the_thread->cpu_time_budget = UINT32_MAX; |
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176 | |
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177 | _Thread_Change_priority( |
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178 | the_thread, |
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179 | _POSIX_Priority_To_core( api->schedparam.sched_ss_low_priority ), |
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180 | NULL, |
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181 | _POSIX_Threads_Sporadic_budget_callout_filter, |
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182 | true |
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183 | ); |
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184 | } |
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185 | |
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186 | /* |
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187 | * _POSIX_Threads_Create_extension |
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188 | * |
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189 | * This method is invoked for each thread created. |
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190 | */ |
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191 | |
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192 | static bool _POSIX_Threads_Create_extension( |
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193 | Thread_Control *executing RTEMS_UNUSED, |
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194 | Thread_Control *created |
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195 | ) |
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196 | { |
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197 | POSIX_API_Control *api; |
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198 | POSIX_API_Control *executing_api; |
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199 | |
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200 | api = created->API_Extensions[ THREAD_API_POSIX ]; |
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201 | |
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202 | /* XXX check all fields are touched */ |
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203 | api->thread = created; |
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204 | _POSIX_Threads_Initialize_attributes( &api->Attributes ); |
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205 | api->schedpolicy = _POSIX_Threads_Default_attributes.schedpolicy; |
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206 | api->schedparam = _POSIX_Threads_Default_attributes.schedparam; |
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207 | api->schedparam.sched_priority = |
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208 | _POSIX_Priority_From_core( created->current_priority ); |
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209 | |
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210 | /* |
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211 | * If the thread is not a posix thread, then all posix signals are blocked |
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212 | * by default. |
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213 | * |
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214 | * The check for class == 1 is debug. Should never really happen. |
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215 | */ |
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216 | RTEMS_STATIC_ASSERT( SIGNAL_EMPTY_MASK == 0, signals_pending ); |
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217 | if ( _Objects_Get_API( created->Object.id ) == OBJECTS_POSIX_API |
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218 | #if defined(RTEMS_DEBUG) |
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219 | && _Objects_Get_class( created->Object.id ) == 1 |
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220 | #endif |
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221 | ) { |
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222 | executing_api = _Thread_Get_executing()->API_Extensions[ THREAD_API_POSIX ]; |
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223 | api->signals_unblocked = executing_api->signals_unblocked; |
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224 | } |
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225 | |
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226 | _Watchdog_Preinitialize( &api->Sporadic_timer, _Per_CPU_Get_by_index( 0 ) ); |
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227 | _Watchdog_Initialize( |
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228 | &api->Sporadic_timer, |
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229 | _POSIX_Threads_Sporadic_budget_TSR |
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230 | ); |
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231 | |
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232 | return true; |
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233 | } |
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234 | |
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235 | static void _POSIX_Threads_Terminate_extension( Thread_Control *executing ) |
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236 | { |
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237 | POSIX_API_Control *api; |
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238 | ISR_lock_Context lock_context; |
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239 | |
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240 | api = executing->API_Extensions[ THREAD_API_POSIX ]; |
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241 | |
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242 | _Thread_State_acquire( executing, &lock_context ); |
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243 | |
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244 | if ( api->schedpolicy == SCHED_SPORADIC ) { |
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245 | _Watchdog_Per_CPU_remove_relative( &api->Sporadic_timer ); |
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246 | } |
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247 | |
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248 | _Thread_State_release( executing, &lock_context ); |
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249 | } |
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250 | |
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251 | /* |
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252 | * _POSIX_Threads_Exitted_extension |
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253 | * |
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254 | * This method is invoked each time a thread exits. |
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255 | */ |
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256 | static void _POSIX_Threads_Exitted_extension( |
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257 | Thread_Control *executing |
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258 | ) |
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259 | { |
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260 | /* |
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261 | * If the executing thread was not created with the POSIX API, then this |
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262 | * API do not get to define its exit behavior. |
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263 | */ |
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264 | if ( _Objects_Get_API( executing->Object.id ) == OBJECTS_POSIX_API ) |
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265 | pthread_exit( executing->Wait.return_argument ); |
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266 | } |
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267 | |
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268 | User_extensions_Control _POSIX_Threads_User_extensions = { |
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269 | .Callouts = { |
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270 | .thread_create = _POSIX_Threads_Create_extension, |
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271 | .thread_exitted = _POSIX_Threads_Exitted_extension, |
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272 | .thread_terminate = _POSIX_Threads_Terminate_extension |
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273 | } |
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274 | }; |
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275 | |
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276 | /* |
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277 | * _POSIX_Threads_Manager_initialization |
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278 | * |
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279 | * This routine initializes all threads manager related data structures. |
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280 | */ |
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281 | static void _POSIX_Threads_Manager_initialization(void) |
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282 | { |
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283 | #if defined(RTEMS_SMP) && defined(__RTEMS_HAVE_SYS_CPUSET_H__) |
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284 | const CPU_set_Control *affinity; |
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285 | pthread_attr_t *attr; |
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286 | |
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287 | /* Initialize default attribute. */ |
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288 | attr = &_POSIX_Threads_Default_attributes; |
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289 | |
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290 | /* Initialize the affinity to be the default cpu set for the system */ |
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291 | affinity = _CPU_set_Default(); |
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292 | _Assert( affinity->setsize == sizeof( attr->affinitysetpreallocated ) ); |
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293 | attr->affinityset = &attr->affinitysetpreallocated; |
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294 | attr->affinitysetsize = affinity->setsize; |
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295 | CPU_COPY( attr->affinityset, affinity->set ); |
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296 | #endif |
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297 | |
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298 | _Thread_Initialize_information( |
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299 | &_POSIX_Threads_Information, /* object information table */ |
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300 | OBJECTS_POSIX_API, /* object API */ |
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301 | OBJECTS_POSIX_THREADS, /* object class */ |
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302 | Configuration_POSIX_API.maximum_threads, |
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303 | /* maximum objects of this class */ |
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304 | true, /* true if names for this object are strings */ |
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305 | _POSIX_PATH_MAX /* maximum length of each object's name */ |
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306 | ); |
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307 | |
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308 | /* |
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309 | * Add all the extensions for this API |
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310 | */ |
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311 | _User_extensions_Add_API_set( &_POSIX_Threads_User_extensions ); |
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312 | |
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313 | /* |
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314 | * If we supported MP, then here we would ... |
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315 | * Register the MP Process Packet routine. |
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316 | */ |
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317 | } |
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318 | |
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319 | RTEMS_SYSINIT_ITEM( |
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320 | _POSIX_Threads_Manager_initialization, |
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321 | RTEMS_SYSINIT_POSIX_THREADS, |
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322 | RTEMS_SYSINIT_ORDER_MIDDLE |
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323 | ); |
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